Maybe Big J is busy with a TSA agent ? Tee hee hee
Hah! You heard about that, eh? Too funny.
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{¥£¤€} is an expert when it comes to towing, so I won't even attempt to add to his comments. They're golden, as far as I'm concerned.
As for payload... you're right Jar, I have been rocking the HD springs for a while and you bet I carry a ton of stuff all the time. Here's how I roll daily:
I'm guessing that's around 400-500lbs of crap.
And then a couple weekends ago I had to load up my and a buddy's camping gear, food and beverages for 3 nights, and a small militia's worth of weapons and ammo. I'm not kidding; every square inch was filled in the cab, and back seat. And in the bed we had stuff piled so high I had to use straps to lock it all down. Our totally unofficial guestament at the payload was somewhere north of 2500lbs all told (my and his bodyweight included; don't forget to count that into your tally when considering payload).
And those springs took it all without even so much as a groan. Now, to be fair, I'm currently rocking RPG's Fox rear shocks as well, so keep that in mind, but my buddy must have said a half a dozen times how impressed he was with the ride given the terrain and load we were pulling.
I don't plan to run with THAT much weight often, but I was really glad to know that I could if I need too. Just another perk of upgrading to these springs.